Who am I ?
I am an isotope of hydrogen that cannot be found in nature and is radioactive .
Tritium
Electrification of objects by rubbing with each other
Static electricity / Frictional Electricity
Isotopes of Uranium is used in
a] fuel in nuclear reactors
b] treatment of goitre
c] radiotherapy for treating cancer
a] fuel in nuclear reactors
X And Y are elements with atomic no.s 11 and 8. State their valencies and no. of shells they will have ?
X =1
Y=2
X shells = 3
Y shells = 4
What is covalency?
Covalency of an atom is the no. of electrons contributed by it for the formation of a covalent bond.
I am the number of electrons present in its neutral atom
Atomic Number
A metallic element,whose one atom readily loses electrons to form positively charged ion.
Electropositive element
The 2n2 rule is part of which theory?
a]Rutherford's atomic model
b]Bohr-Bury scheme
c] Dalton's atomic model
b]Bohr-Bury scheme
An metal X forms an oxide X2O3. What type of bond it is having ? State its valency ?
It is having a electrovalent bond. Its valency is 3.
Why are ionic compounds stable ?
Ionic compounds are stable because though they have a repulsive force of like charges but the electrostatic force of attraction between the unlike the charges is higher which makes the ionic compound stable
I am the fixed circular paths around which the electrons revolve
Energy levels/shells /orbits
The spontaneous decay of unstable radioisotopes
Radioactivity
Rare gases are ___________.
a] Mono-atomic
b] Di-atomic
c] Tri-atomic
a] Mono-atomic
X is non metal who reacts with chlorine and gives XCl4 , It has 3 isotopes. Give the valency of the element , the type of bond, and identify the metal ?
valency = 4
Bond = electrovaleny bond
Element = carbon
What happens to polar compounds when electric current passes through them?
They form ions and ionize in their solutions and act as electrolytes
I am the most ionic compound
Caesium fluroide
When one molecule of hydrogen is added to ethyne it becomes
Ethane
Maximum number of electrons in n shell
a] 18 electrons
b] 32 electrons
c] 50 electrons
a] 32 electrons
M is metal which when reacts with chlorine gives MCl2 . Give the type of bond between them, its formula of its Nitrate, silicate and Oxide ?
Bond = electrovalent
Nitrate = M(NO3)2
silicate = MSiO3
oxide = MODifference between covalent and ionic compounds with respect to (i) boiling and melting points (ii) conduction of electricity
covalent bonds- 1) It has a low boling and melting points
Ionic compound- 2) It has a high boiling and melting point
Covalent compound- 1) Non-conductors of electricity in solid ,molten or aqueous state
Ionic compounds 2) Bad conductors of electricity in solid state but good conductors of electricity in the fused or aqueous state
Name the element. I am a metal, I have 2 valency and my mass no. is between 23-28.
Magnesium
Who proposed the octet theory of valency
Kossel and Lewis
What is the boiling point of protium and deuterium?
a] 20.38 K and 22K
b] 23.5 K and 21 K
c] 20.38 K and 23.5 K
c] 20.38 and 23.5 K
Y is metal with formula of its oxide being X2O . Give the valency of the element, Its formula with Dichromate , carbonate , Bicarbonate, Hypochlorite .
Valency = 1
Dichromate = X2CR2O7
Carbonate = X2CO3
Bicarbonate = XHCO3
Hypochlorite = XClO
What are polar covalent compounds? Give 2 examples
When the shared pair of electrons in a compound are not at equal distance between the two atoms, they are considered as polar covalent compouds.
E.g: HCl, HF